``` inline fun <T : Any?, R> T.notNullOrElse...

# announcements

[ribesg]

inline fun <T : Any?, R> T.notNullOrElse(notNull: (T) -> R, orElse: (T) -> R): R =
    if (this != null) notNull(this) else orElse(this)

val x: String? = "test"
x.notNullOrElse(
    { println(it) },
    { println("x is null") }
)

[gildor]

Would be nice to add inline

[gildor]

Problem with all such solutions is you need version for multiple arguments.

[ribesg]

I really prefer to just define a variable and have an if (x == null)

[gildor]

yes, same for me, we don’t have such helper functions in our project

[gildor]

if just looks better

[gildor]

also there is similar case, when you want to check multiple values for null and use them only if everything is not null, you can do this using function like:

fun <A, B, C, R> ifNonNull(a: A?, b: B?, c: C?, block: (A, B, C) -> R): R?

[gildor]

it’s similar to applicative from functional programming

[gildor]

but after some concideration we decided that default constructions is enough for us, we don’t have many cases where we need it and usually you can solve it using local varialbes + early return:

val a = getA() ?: return
val b = getB() ?: "default b"
val c = getC() ?: error("c is null")
doSomething(a + b + c)